Abstract: A lower unit for a marine propulsion device includes a drive shaft housing having a lower end, a gearcase housing connected to the lower end of the drive shaft housing and having an interior wall defining an elongated cavity, the interior wall including a first surface portion transverse to the longitudinal axis of the elongated cavity and a second surface portion transverse to the longitudinal axis and spaced circumferentially from the first surface portion. A propeller shaft is located in and extends axially through the gearcase housing cavity, and a propeller is supported on the propeller shaft. A hollow bearing carrier member encircles the propeller shaft for rotatably supporting the propeller shaft inside the gearcase housing. The bearing carrier member is supported by the interior wall of the gearcase housing and carries a bearing rotatably engaging the propeller shaft.

Abstract: Disclosed herein is a carburetor for internal combustion engines having an automatic choke control mechanism including a vacuum diaphragm assembly operatively connected to a choke lever for opening a spring-biased closed choke valve and holding it open at idling and lower engine speeds and a linkage arrangement interconnecting a throttle valve lever and the choke lever for holding the choke valve open at higher engine speeds independently of the vacuum diaphragm assembly. The linkage arrangement includes a spring-biased choke pull-out lever which is held in a locked position during engine idling and lower engine speeds by a link having one end slidably received in a slot in the choke pull-out lever and the other end connected to the throttle lever.

Abstract: Disclosed herein is a rotary internal combustion engine comprising a housing assembly including first and second substantially identical housing members extending in spaced, parallel and aligned relation to each other and respectively including wall means partially defining first and second trochoid shaped rotor cavities and additional wall means partially defining first and second water jackets respectively extending partially circumferentially of the cavities and respectively including circumferentially spaced inlet and outlet ends, a first wall member located adjacent to the first housing member remotely from the second housing member and further defining the first rotor cavity and including coolant inlet means communicating with the inlet end of the first water jacket, a second wall member located adjacent to the second housing member remotely from the first housing member and further defining the second rotor cavity and including outlet means communicating with the outlet end of the second water jacket,

Abstract: Disclosed herein is a rotary internal combustion engine comprising a unitary housing member including first annularly extending wall means including an outwardly facing surface partially defining a cooling jacket extending generally circumferentially around the first wall means, and an inwardly facing surface partially defining a rotor cavity, together with second wall means extending in outwardly spaced relation from the first wall means and including an inwardly facing surface in opposing relation to the outwardly facing surface of the first wall means to further partially define the cooling jacket, and web means extending generally transversely to and joining the first and second wall means.

Abstract: Disclosed herein is an engine block including first wall portions defining a combustion chamber, second wall portions defining a bore including a first portion extending from the combustion chamber and a second portion enlarged with respect to the first portion, third wall portions defining a water jacket in cooling relation to the second wall portions, and an elongated duct of heat resistant material communicating through the first bore portion with the combustion chamber so as to receive exhaust gases discharged therefrom, which duct is circumferentially engaged by and supported from the second wall portion at locations spaced lengthwise of the duct and extends in the enlarged bore portion in spaced relation from the second wall portions intermediate the locations, whereby there is provided a stagnant air space between the duct and the block intermediate the locations so as to reduce heat transmission from the duct.